How to retain or manually set the service IP address for docker-registry in Openshift 3

Solution Unverified - Updated

Issue

  • I deleted the registry how do I recreate one with the original service IP address.
  • My registry got recreated with the wrong service IP address.
  • How to I manually configure the docker registry with a service IP address of my choosing using an IP in the service ClusterIP subnet.

Resolution

  • Follow the steps below to recreate the docker-regsitry with the a manually set service ClusterIP value:

  1. Make note of the original IP address and back up the original deployment configuration. 

         #  oc get service -n default

     NAME                    CLUSTER_IP             PORT(S)                             SELECTOR            
     docker-registry    172.30.222.215         5000/TCP                           docker-registry=default
     kubernetes           172.30.0.1                 443/TCP,53/UDP,53/TCP    <none>            
     router                   172.30.10.230           80/TCP                               router=router       

     # oc export dc docker-registry -n default > registry-dc.yaml.bak

  2. Delete old docker-registry.

        # oc delete all -l docker-registry -n default

    deploymentconfig "docker-registry" deleted
    route "docker-registry" deleted
    service "docker-registry" deleted
    pod "docker-registry-5-pajc3" deleted

  3. Create a new docker-registry template using the appropriate command from the documentation that matches your version (This page is not included, but the link has been rewritten to point to the nearest parent document.3.0, This page is not included, but the link has been rewritten to point to the nearest parent document.3.1, This page is not included, but the link has been rewritten to point to the nearest parent document.3.2, or 3.3) and then putting the output into a file.

    # oadm registry --config=/etc/origin/master/admin.kubeconfig     --credentials=/etc/origin/master/openshift-registry.kubeconfig     --images='registry.access.redhat.com/openshift3/ose-${component}:${version}' -o yaml > registry.yaml

  4. Add spec.clusterIP and spec.portalP with the value of the ClusterIP of the old docker-registry to the docker-registry template created. 

        # vim registry.yaml

    - apiVersion: v1
      kind: Service
      metadata:
        creationTimestamp: null
        labels:
          docker-registry: default
        name: docker-registry
      spec:
        clusterIP: 172.30.222.215
        portalIP: 172.30.222.215
        ports:
        - name: 5000-tcp
          port: 5000
          targetPort: 5000

  5. Run oc create add the modified docker registry back to your environment 

         # oc create -f registry.yaml

     deploymentconfig "docker-registry" created
     service "docker-registry" created

  6. Continue configuring your docker registry up to your specifications.

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